The car will pull to the side with the least caster. ~.5* less caster on the L is a good start. Even caster will cause a pull to the right on just about any chassis, but if the tech put less caster on the R, then that's just ignernt.

Subframe bushings can cause a shift in thrust line, but that's not what I see here. This is mostly a change on the RR. Could be bushings, or the target/sensor of the alignment machine. The camera based machines with targets are easy to mess up. The targets that mount to the wheels can shift during compensation for a couple of reasons, making any measurement on that wheel invalid. The ones with sensors on the wheels clamp to the wheels pretty tight and rarely shift. Another possibility is that the rear slip plates were locked on the lift. Some have pins to remove, others are locked in by other means. If the rear slip plates are locked, you can't trust the rear axle measurements.

A possible cause for the rear axle camber change could be a change in rear ride height.